Traco window balances

A quick learner from Ottowa Hills says:
I have 2 apartment buildings with TRACO replacement windows that are probably about 15 years old (I am a new owner. The spiral balance in EVERY double hung window has failed in the lower sashes and some in the upper sashes. My question to you is: Does this seem right? Should I be ordering stronger window balances or replace them with what I remove? Also, some windows that are the same size DO NOT have the same size spiral balance? I have a kitchen window with a 17 BlUE 600 series and another one - same size that has a 19 Blue 600 series. Please advise? THANK YOU
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Paul from SWISCO responded:

We have known Traco to use spiral balances, like our Series 600, in their windows. There's a chance you may just need to adjust them with a charging tool, like our 75-006. We included some helpful media guides on this page that shows how to charge the balance. 

In regards to different lengths in the same window, the top and bottom sash are different. Usually the top sash balance is 2" less than the bottom sash. 

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